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| This essay was first published in the Newsletter of the Association for Women in Mathematics, Fall 2022. Suggested citation: Lai, Y. (2022, Sep/Oct). Making mathematical claims. AWM Newsletter 52(5), 24-27. How many non-congruent quadrilaterals can you make with vertices in the 9-dot square grid shown below? How would you organize those quadrilaterals into categories?[1] [1]...